LG 32LG710H Service Manual page 46

Digital RF Trouble shooting guide
Check RF Cable
Check Tuner 5V Power
Check IIC Signal
TU100 #7, 8 Pin
Check IF Signal
TU1001 #10, 11 Pin
Check LGDT3305 Output
Clock(R141), Data(R142)
, Sync(R140)
Check X100
and application circuit
Replace IC101
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Only for training and service purposes
Y
N
IC401
Y
N
Check IIC line and level shifter
Y
N
Check tuner application circuit or
Y
Maybe LGDT3305(IC1001) has
N
Y
N
Y
Replace IC401
circuit
replace tuner.
problems
Replace X1200
LGE Internal Use Only